Hi, On lun. 4 mars 11:05:59 2019, Alarig Le Lay wrote: > Hi, > > I upgraded one of my routers to 4.19, and I experienced some loss on > IPv6 only. It led to BGP sessions going down and ping loss (~10 %) while > IPv4 was still all good, even on the neighbors. > I reverted to 4.14, and now all is fine again. > > From what I saw, it happens only after a certain amount of traffic, I > would say ~30 Mbps. And as the traffic increases, the frequency of the > loss increases also.
I tried the kernel 4.19.27 and I have the same issue. I used ip-monitor(8) to dump the RTLINKS messages. Some minutes before the machine becomes unreachable, the NDP cache begins to be filed with FAILED entries instead of STALE/PROBE/REACHABLE. When the machine is unreachable, there are INCOMPLETE entries. Then, the machine goes dark for a couple of minutes, and all is fine again after that… until the next time. This night, it appears at 22:48:31, 00:29:33 and 02:36:16. If I tcpdump on the interface while the machine is offline, I see NDP NS for the IPv6 of the machine on eth0. So it may be a DAD issue, but then why does it work with 4.14? I looked a bit on the commits on the kernel, and it also could be https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=0565de29cbd65b378147d36f9642f93a046240dc but I’m not very comfortable with C language. For the first one, this is the RTLINK error messages I get for my neighbors: judicael-ovpn ~ # ip monitor file /var/log/rtmon.log | sed -s 'N;/proto bird/!P;D' | grep -B1 -E 'FAILED|INCOMPLETE' | less Timestamp: Sun Mar 24 22:42:25 2019 247039 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:42:38 2019 47256 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:42:43 2019 39170 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:42:48 2019 799065 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:42:59 2019 39159 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:03 2019 327141 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:08 2019 895060 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:14 2019 719129 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:49 2019 727107 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:43:53 2019 119277 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:56 2019 255144 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:43:59 2019 519199 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:44:02 2019 527022 us 2a00:5884:0:6::1 dev eth0 router FAILED Timestamp: Sun Mar 24 22:44:05 2019 663129 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:44:23 2019 7025 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:44:47 2019 583049 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:44:51 2019 679047 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:03 2019 967031 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:07 2019 807264 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:15 2019 743063 us 2a00:5884:0:6::7 dev eth0 router FAILED Timestamp: Sun Mar 24 22:45:18 2019 879282 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:40 2019 831147 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:43 2019 903393 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:45:59 2019 263107 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:46:09 2019 503135 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:47:06 2019 847109 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:47:43 2019 712028 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:47:46 2019 847107 us 2a00:5884:0:6::7 dev eth0 router FAILED Timestamp: Sun Mar 24 22:47:50 2019 495080 us 2a00:5884:0:6::7 dev eth0 router FAILED Timestamp: Sun Mar 24 22:47:54 2019 335055 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:02 2019 207072 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:05 2019 232101 us 2a00:5884:0:6::2 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:08 2019 287041 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:08 2019 991081 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:11 2019 807289 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:12 2019 319072 us 2a00:5884:0:6::2 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:12 2019 383037 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:14 2019 943219 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:15 2019 455254 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:15 2019 601432 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:17 2019 631154 us 2a00:5884:0:6::7 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:18 2019 207194 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:18 2019 608870 us fe80::21b:21ff:fe48:6899 dev eth0 router INCOMPLETE -- Timestamp: Sun Mar 24 22:48:21 2019 489165 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:21 2019 717483 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:22 2019 495098 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:24 2019 863391 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:24 2019 863494 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:26 2019 207022 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:27 2019 935515 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:28 2019 180192 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:28 2019 639222 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:31 2019 271021 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:31 2019 286776 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:31 2019 775062 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:34 2019 946882 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:35 2019 39132 us 2a00:5884:0:6::2 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:35 2019 103143 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:35 2019 935126 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:38 2019 99264 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:39 2019 647160 us 2a00:5884:0:6::1 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:40 2019 555282 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:41 2019 503211 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:41 2019 631066 us 2a00:5884:0:6::2 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:42 2019 975053 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:45 2019 107089 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:46 2019 239151 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:48 2019 273820 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:48 2019 415024 us 2a00:5884:0:6::7 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:49 2019 775827 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:51 2019 660899 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:51 2019 824833 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:52 2019 959083 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:54 2019 879209 us 2a00:5884:0:6::2 dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:54 2019 890052 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:55 2019 147895 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:48:58 2019 96948 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:48:58 2019 463094 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:00 2019 127138 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:01 2019 343179 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:04 2019 641427 us fe80::210:18ff:fe68:be0e dev eth0 router INCOMPLETE -- Timestamp: Sun Mar 24 22:49:06 2019 271034 us 2a00:5884:0:6::1 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:07 2019 679069 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:07 2019 743195 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:10 2019 175142 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:11 2019 29718 us fe80::210:18ff:fe68:be0e dev eth0 router INCOMPLETE Timestamp: Sun Mar 24 22:49:13 2019 695303 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:14 2019 95883 us fe80::210:18ff:fe68:be0e dev eth0 router INCOMPLETE Timestamp: Sun Mar 24 22:49:14 2019 399092 us 2a00:5884:0:6::1 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:16 2019 895040 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:17 2019 151183 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:17 2019 535109 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:20 2019 171736 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:20 2019 799042 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:25 2019 616220 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:26 2019 111135 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:27 2019 647095 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED Timestamp: Sun Mar 24 22:49:27 2019 647121 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:34 2019 815028 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:37 2019 375088 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:43 2019 519286 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:46 2019 94613 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:48 2019 127028 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:52 2019 739028 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:49:54 2019 783137 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:01 2019 967817 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:04 2019 143 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:11 2019 191125 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:12 2019 191021 us 2a00:5884:0:6::1 dev eth0 router FAILED Timestamp: Sun Mar 24 22:50:13 2019 232549 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:13 2019 727170 us 2a00:5884:0:6::2 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:18 2019 15125 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:19 2019 871071 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:22 2019 431088 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:27 2019 359093 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:29 2019 105497 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:33 2019 183037 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:34 2019 335082 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:38 2019 303192 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED Timestamp: Sun Mar 24 22:50:41 2019 503069 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:50:42 2019 399006 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:47 2019 7085 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:51 2019 551116 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED Timestamp: Sun Mar 24 22:50:51 2019 615065 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:56 2019 223040 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:50:58 2019 783088 us 2a00:5884:0:6::1 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:51:00 2019 330902 us fe80::210:18ff:fe68:be0e dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:51:00 2019 959104 us fe80::be30:5bff:fed2:d098 dev eth0 router FAILED -- Timestamp: Sun Mar 24 22:51:05 2019 439079 us fe80::21b:21ff:fe48:6899 dev eth0 router FAILED -- -- Alarig
